Lan Li, Chengjie Yin, Rong Han, Fujie Zhong, Jinsong Hu
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引用次数: 0
Abstract
Rechargeable aqueous zinc-ion batteries (AZIBs) have developed into one of the most attractive materials for large-scale energy storage owing to their advantages such as high energy density, low cost, and environmental friendliness. Nevertheless, the sluggish diffusion kinetics and inherent impoverished conductivity affect their practical application. Herein, the β-MnO2 composited with carbon nanotubes (CNT@M) is prepared through a simple hydrothermal approach as a high-performance cathode for AZIBs. The CNT@M electrode exhibits excellent cycling stability, in which the maximum specific discharge capacity is 259 mA h g–1 at 3 A g–1, and there is still 220 mA h g–1 after 2000 cycles. The specific capacity is obviously better than that of β-MnO2 (32 mA h g–1 after 2000 cycles). The outstanding electrochemical performance of the battery is inseparable from the structural framework of CNT and inherent high conductivity. Furthermore, CNT@M can form a complex conductive network based on CNTs to provide excellent ion diffusion and charge transfer. Therefore, the active material can maintain a long-term cycle and achieve stable capacity retention. This research provides a reasonable solution for the reliable conception of Mn-based electrodes and indicates its potential application in high-performance AZIB cathode materials.
可充电锌离子水电池(AZIBs)具有能量密度高、成本低和环境友好等优点,已发展成为最有吸引力的大规模储能材料之一。然而,缓慢的扩散动力学和固有的低导电性影响了它们的实际应用。在此,我们通过简单的水热法制备了与碳纳米管(CNT@M)复合的β-MnO2,作为 AZIBs 的高性能阴极。CNT@M 电极表现出优异的循环稳定性,在 3 A g-1 条件下,最大比放电容量为 259 mA h g-1,循环 2000 次后仍有 220 mA h g-1。比容量明显优于β-MnO2(2000 次循环后为 32 mA h g-1)。该电池出色的电化学性能与 CNT 的结构框架和固有的高导电性密不可分。此外,CNT@M 还能在 CNT 的基础上形成复杂的导电网络,提供出色的离子扩散和电荷转移。因此,活性材料可以保持长期循环,实现稳定的容量保持。这项研究为锰基电极的可靠构想提供了合理的解决方案,并预示着其在高性能 AZIB 阴极材料中的潜在应用。
期刊介绍:
Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.